...achusetts, by her bill of rights, abolished slavery in 1780, and the act went into full effect by the decision of her courts in 1783, and no slaves are shown by the census of 1790. In the same year Pennsylvania barred the further introduction of slaves, and also enacted a law for their gradual emancipation, and the census taken in 1840 found but sixty-four in servitude within her boundaries. In 1784 Conn...